If Brazilians speak a language originated from Portugal, how did they lose their European Portuguese accent?

Answer 1

This is such an interesting questions, because the answer is such as well. I'm not sure of your familiarity with Brazilian Portuguese versus standard Portuguese, but there are some linguists and scholars who provide an interesting answer to this. Around the 1600's there were a lot of Portuguese migrating to Brazil, and this was also known as the "new world". So, some argue that the Portuguese spoken in Brazil is closer to the 17th century Portuguese spoken in Portugal, though by isolation (the Atlantic Ocean) of other lusophones (Portuguese speakers), the accent never evolved in Brazil as it did in Portugal. Brazil also has an influence of native and slave languages, which more affects vocabulary than pronunciation - but, it's still there. So, you might say that Brazilian Portuguese is closer to "old Portuguese". This is similar to the theory of why quebecois and standard parisien French are different.

Please note that these are theories, and there can be no confirmation that these theories are correct or incorrect. That's the beauty of history !